Mechanical Properties of Si<sub>3</sub>N<sub>4</sub>/AlN-Al Composites Prepared by Pressure-free Infiltration

Wang Yangwei; Yu Xiaodong; Wang Fuchi; Ma Zhuang; Zhang Weiguan

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Mechanical Properties of Si₃N₄/AlN-Al Composites Prepared by Pressure-free Infiltration
Issue 5, Pages: 335-337(2008)
Published： 2008 ，
DOI：

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[1]王扬卫,于晓东,王富耻,马壮,张维官.无压浸渗制备Si_3N_4/AlN-Al复合材料的力学性能[J].特种铸造及有色合金,2008(05):335-337+323.

Wang Yangwei, Yu Xiaodong, Wang Fuchi, et al. Mechanical Properties of Si₃N₄/AlN-Al Composites Prepared by Pressure-free Infiltration. [J]. Special Casting & Nonferrous Alloys (5):335-337(2008)
[1]王扬卫,于晓东,王富耻,马壮,张维官.无压浸渗制备Si_3N_4/AlN-Al复合材料的力学性能[J].特种铸造及有色合金,2008(05):335-337+323. DOI：

Wang Yangwei, Yu Xiaodong, Wang Fuchi, et al. Mechanical Properties of Si₃N₄/AlN-Al Composites Prepared by Pressure-free Infiltration. [J]. Special Casting & Nonferrous Alloys (5):335-337(2008) DOI：

摘要

采用优化的无压浸渗制备工艺（氮气气氛

950℃下浸渗4h）制备具有不同陶瓷含量的Si3N4/AlN-Al复合材料

分析了复合材料力学性能随陶瓷含量变化的规律以及复合材料的断裂特征。结果表明

随着Si3N4多孔预制体陶瓷体积分数从30.2%增加到60.6%

无压浸渗制得的复合材料单轴压缩强度从620MPa增加到1728MPa

抗弯强度从429.8MPa增加到672.4MPa

硬度（HRA）从55增加到83

而断裂韧度则从10.55MPa.m1/2下降到2.26MPa.m1/2;SiN/AlN-Al复合材料内的裂纹主要在"残留的粗大SiN颗粒"、"疏松区"和"粗大的MgSi相"3种区域萌生。

Abstract

The Si3N4/AlN-Al composites with different ceramic contents were successfully prepared in N2 atmosphere by optimized pressure-free infiltration process at 950 ℃ for four hours. The flexural strength

compressive strength

fracture toughness and hardness of the prepared composites were measured to understand the effects of ceramic content on mechanical properties and fracture morphology of composites. The results reveal that with the increase of Si3N4 content in the performs from 30.2% to 60.6% （in volumetric fraction）

the compressive strength

flexural strength and hardness of the composites can be increased from 620 MPa to 1 728 MPa

from 429.8 MPa to 672.4 MPa and from 55 to 83

respectively

with the decrease of fracture toughness from 10.55 MPa·m1/2 to 2.26 MPa·m1/2. The crack in the Si3N4/AlN-Al composites is formed at!three types of zones including remained coarse Si3N4 particles

loosen sections and coarse Mg2Si phase.